Legion is book 4 of Julie Kawaga's Talon series. I experienced it through audiobook form, and the review is smaller in part because of this.
When all seems lost, there is one more thing to give...
Dragon hatchling Ember Hill was never prepared to find love at all, let alone with a human former dragonslayer. With Garret dying at her feet after sacrificing his freedom and his life to expose the deepest of betrayals, Ember knows that nothing she was taught by dragon organization Talon is true. About humans, about rogue dragons, about herself.
Ember vows to stand against St. George and her own twin brother, Dante—the heir apparent to all of Talon, and the boy who will soon unleash the greatest threat and terror dragonkind has ever known. Talon is poised to conquer the world, and the abominations they have created will take to the skies, bringing blood and death to those who will not yield. With nothing to lose beyond their lives, Ember and her allies prepare for all-out war.
This is admittedly a transition book as the plot focuses more on the dragon dynamics, which wasn't horrible, but it did make the book a bit lackluster. Still like it more than the second book, but I think the third was better. This did take some steps forward that I loved because it moved away from the aspects I wasn't a big fan of, and it brought back characters I had been hoping to see. It also went a way that I had momentarily suspected with Ember's origin after book 3, but it was just one of a few theories I had. I'm not sure if I would have preferred it went the other angle, but at the same time, I think the angle it did go shown a better light on dragons than my theory of her being half human child and that being why she had more humanity to her. Also, as I said before, the start of this book makes me absolutely despise the end of last book because it's so stupid and forced drama/cliffhanger stuff :)